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更多“单项选择It has —— eyes（）”相关的问题
A.It has big eyes and small ears
B.It has small eyes and big ears
C.It has small eyes and small ears
A.The elephant has a long tail and big eyes
B.The elephant has a long nose and big ears
C.The elephant has a short nose and big ears
A.My mother has small eyes, big ears and short hair
B.Your mother has big eyes, small ears and long hair
C.My mother has big eyes, small ears and long hair
A.My friend has a big nose and a small mouth
B.My friend has a big mouth and small eyes
C.My friend has big eyes and a small mouth
There is evidence that man is changing, ______.
A．he has been growing taller over the past 500 years
B．he has got stronger eyes than he ever had
C．his hair is getting thinner and thinner
D．his limbs are getting weaker because he tends to make less use of them
There is evidence that______.
A．man has been growing taller over the past 500 years
B．man has got stronger eyes than he ever had
C．man's hair is getting thinner and thinner
D．man's limbs are getting weaker because he tends to make less use of them
Some researchers recently have studied the eyes of the common frogs and have discovered that a frog's eyes only find moving things such as insect-shaped objects and large, threatening objects. As a result of studying the eyes of frogs, scientists have constructed a simple electronic model of a frog's eyes which can track airplanes circling above an airport and then provide information to computer-run air traffic control systems. Someday such electronic eyes may provide the means to automatically guide automobiles by providing information about objects moving toward the automobile. Other scientists have studied the compound eyes of some insects and crabs and have built a seeing machine that is a simple model of the horseshoe crab eye.
The hearing of a number of creatures also has been studied extensively so that hearing machines can be developed. Bats have unusual hearing which can extend into the ultrasonic (超声的) range. The dolphin also has been studied extensively, and dolphins are able to navigate through water extremely effectively. Radar and sonar(声 纳) systems which are used to help ships and planes navigate have been based on the sonar systems of both bats and dolphins.
Which of the following could be the best title？
A．Electronic Eyes
B．The Science of Bionics
C．Sonar Systems
D．The Hearing of Some Creatures
If one pupil contracts (7)_____ the other doesn't, the physician is (8)_____ to the fact that (9)_____ a tumor or stroke, perhaps, has damaged the nerves between the eye and brain. A tumor as far away (10)_____ the lung can cause capillary problems by hitting a nerve that loops through the neck.
The white of the eye, tear ducts, lens and retina(视网膜) are checked for (11)_____ of trouble. Too many white blood cells (12)_____ inflammation, blood means tissue has tom or a vessel has burst, and deposits of (13)_____ material can mean eye disease. The orange-red retina holds many more (14)_____ for disease detection. High blood pressure may announce its (15)_____ by pushing the vessels off track at their intersections. (16)_____ vessel growth is a sign of diabetic retinopathy(糖尿病性视网膜病). Narrowed vessels may indicate (17)_____ of the arteries, and damage to tiny capillaries could be a sign of early diabetes.
The doctor even examines the pin-head-size hole in the back of the optic nerve on their way to the brain. (18)_____ the appearance of these nerve fibers is abnormal, nerve tissue may have been damaged because of intraocular pressure, indicating glaucoma or the presence of a tumor. When a physician needs quick, (19)_____ information about the body, the eyes have (20)_____.
A．entire
B．intact
C．eye
D．informative
When we see well, we do not think about our eyes very often. (79) It is only when we cannot see perfectly that we realize how important our eyes are.
People who are nearsighted can only see things that are very close to their eyes. Everything else seems blurry (模糊的). Many people who do a lot of close work, such as writing, reading and sewing, become nearsighted. Then they have to wear glasses in order to see distant objects clearly.
People who are farsighted suffer from just the opposite problem. They can see things that are far away, but they have difficulty in reading a book unless they hold it at arm's length. If they want to do much reading, they must get glasses, too.
Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism (散光). This, too, can be corrected by glasses. Some people's eyes become cloudy because of cataracts (白内障). Long ago these people olden became blind. Now, however, it is possible to operate on the cataracts and remove them.
Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle. To prove this to yourself, look at object out of one eye; then look at the same object out of your other eye. You will find the object's relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.
We should take good care of our eyes ______.
A．only when we can see well
B．only when we cannot see perfectly
C．even if we can see dell
D．only when we realize how important our eyes are
People who are nearsighted can only see things that are very close to their eyes. Everything else is not so clear. Many people who do a lot of close work, such as writing, reading and sewing, become near sighted. Then they have to wear glasses in order to see distant (远处的) things clearly'.
People who are nearsighted suffer from just the opposite problem. They can see things that are far away, but they have difficulty in reading a book unless they hold it at arm's length. If they want to do much reading, they must get glasses, too.
Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism (散光). This, too, can be corrected by glasses. Some people's eyes become cloudy because of cataracts (白内障). Long ago these people often became blind. Now, however, it is possible to operate on the cataracts and remove them.
Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle (角度). To prove this to yourself, look at an object out of one eye; then look at the same object out
of the other eye. You will find the object's relation to the background (背景) and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.
We should take good care of our eyes ______.
A．only when we cannot see perfectly
B．only when we can see well
C．even if we can see well
D．only when we realize how important our eyes are
Sports and games should not be treated only as amusements (娱乐活动). They can【24】our bodies, prevent us【25】getting too fat, and keep us healthy. But these are not their only uses. They give us valuable practice【26】helping the eyes, brain and muscles (肌肉) to work together. In table tennis, the eyes can see the ball【27】, judge its speed and direction, and pass this information【28】to the brain. The brain then has to decide what to do, and sends its orders to the muscles of the arms, legs, and so on,【29】the ball is met and hit back【30】 the player wants it to go. All this must happen【31】 a very quick speed, and only those【32】 have had a lot of practice at table tennis can do this successfully.
Sports and games are also very useful【33】 character-training. In their lessons at school, boys and girls【34】 learn about such virtues(品德) as courage, discipline(纪律), and love【35】 one's country.
(41)
A．However
B．But
C．Otherwise
D．Therefore
